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PDF HV9805 Data sheet ( Hoja de datos )
| Número de pieza | HV9805 | |
| Descripción | Off-Line LED Driver | |
| Fabricantes | Microchip | |
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HV9805
Off-Line LED Driver with True DC Output Current
Features
• Provides True DC Light and protects load from
line voltage transients
• Driver topology includes:
- Boundary Conduction Mode (BCM) Boost
Converter with Power Factor Correction
a) High Power Factor (98% typical)
b) High Efficiency (90% typical)
- Linear Post-Regulator with Low Overhead
Voltage
a) Zero LED Current/Brightness Ripple
b) Overvoltage Protection for LEDs
c) High Efficiency
d) ±4% Reference Over Temperature
• Simple VDD Supply:
- No Auxiliary Winding Required
• Boost Converter Cascode Switch:
- Internal Switch rated at 700 mA peak
- Supports up to 25W at 120VAC
- Supports up to 50W at 230VAC
• Compatibility with SEPIC Topology for
Low Output Voltage Applications
Applications
• LED Lamps
• LED Lighting Fixtures
Network Topology Diagram
General Description
The HV9805 driver integrated circuit (IC) is targeted at
general LED lighting products, such as LED lamps and
LED lighting fixtures with a maximum power rating of
about 25W at 120VAC and about 50W at 230VAC.
A two-stage topology provides true constant current
drive for the LED load while drawing mains power with
high power factor. The first stage, a boundary
conduction mode boost converter, transfers power
from the AC line to a second stage with high power
factor and high efficiency. The second stage, a linear
regulator arranged for operation with low overhead
voltage, transfers power from the first stage to the LED
load with true constant current and protects the LED
load from overvoltage that may pass from mains to the
output of the first stage.
The IC is particularly geared to drive a high voltage
LED load. An LED load arranged as a high-voltage load
is capable of offering cost advantages in terms of heat
management and optics.
The boost converter employs a cascode switch for
high-speed switching and convenient generation of the
VDD supply. The control device of the cascode switch is
an integral part of the HV9805 and is rated at 700 mA
peak. Current for powering the VDD supply is derived
by way of an internal connection to the cascode switch.
Applications with low output voltage can be
accommodated using the SEPIC topology.
AC
2015 Microchip Technology Inc.
DS20005374A-page 1
1 page  
HV9805
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +12V
VDRV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +20V
VCSL, VCSH, VBVS, VCRS, VCRG, VHVS, VHVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +5.5V
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Power Dissipation at 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625 mW
ESD protection on all pins (HBM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV
ESD protection on all pins (MM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150V
† Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods
may affect device reliability.
DC AND AC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all specifications apply at VDD = 8.2V, TA = TJ = +25°C,
fSWI = 100 kHz.
Boldface specifications apply over the ambient temperature (TA = TJ) range of -40°C to +125°C.
Parameter
Sym. Min. Typ. Max. Unit
Conditions
VDD Supply (VDD)
Enable Threshold Voltage
Disable Threshold Voltage
Linear Regulator Resistance
VDD Voltage
Switching Regulator Control Gain
KVDD = (TON,VDDFET)/(VDD)
Supply Current, RUN State,
Measured at DRV Pin
VENA
7.2 7.5 7.8
V VDD rising
VDIS
6.4 6.7 7.1
VDD falling
RREG
0.42
—
1.2
k
VDD 7.9 8.2 8.6
V
KVDD — 3 — µs/V VDD = 8.0V (Note 2)
IDD
1 2.5 5
mA
First Stage, Boost Regulator (DRV)
Control FET On-Resistance
Overcurrent Comparator Threshold
Overcurrent Comparator Blanking Time
Nominal On-Time
Maximum On-Time
Maximum Off-Time
RDRV
IOCP
TBLK
TONN
TONH
TOFH
—1—
0.75 — 2.75
— 330 —
— 2.7 —
8 — 13
80 — 110
A
ns
µs
Headroom Voltage Regulator (HVS, HVR)
Regulator Reference Voltage
Run Comparator Threshold
Regulator Output Voltage,
Maximum Level
VREF,HVR
VRUN
VHVR
1.17
—
—
1.25
1.25
5.0
1.32
—
5.5
V
Regulator Control Gain
KHVR = (TON, DRVFET)/(VHVR)
KHVR
— 2.2 —
µs/V
Control Amplifier Transconductance
GHVR 55 75 95 µA/V
Control Amplifier Sink Current
ISNK,HVR
50
—
80
µA
Control Amplifier Source Current
ISRC,HVR
50
—
80
Note 1: Specification is obtained by characterization and is not 100% tested.
2: Specification is for design guidance only.
Note 2
Note 2
VHVR = 1.2V (Note 2)
Note 2
VHVR = 1.0V (Note 2)
VHVR = 2.5V, VHVS = 2.25V
VHVR = 2.5V, VHVS = 0.25V
2015 Microchip Technology Inc.
DS20005374A-page 5
5 Page 
HV9805
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Pin Symbol
1 VDD
2 CSL
3 CSH
4 HVS
5 HVR
6 CRS
7 CRG
8 BVS
9 GND
10 DRV
I/O Description
— Pin for support of the VDD supply
I Non-inverting input pin of the current sense amplifier of the first stage
I Inverting input pin of the current sense amplifier of the first stage
I Input pin of the headroom voltage sense amplifier
O Output pin of the headroom voltage regulator control amplifier
I Input pin of the current sense amplifier of the second stage
O Output pin of the constant current regulator control amplifier
I Input pin of the bus voltage sense amplifier
— Ground pin
O Drive pin for control of the boost converter switch
3.1 VDD Supply Support Pin (VDD)
The VDD supply is not capable of sourcing a significant
current to external circuitry. A significant source of sup-
ply current can be created by means of an auxiliary
winding on the boost inductor.
Connect a 10 μF ceramic capacitor between the VDD
and GND pins to provide VDD supply filtering and VDD
supply holdup.
A sizable holdup capacitor is required to maintain an
adequate VDD supply voltage near the zero crossings
of the AC line voltage, where the supply of current to
the VDD supply circuit drops off significantly.
3.2 Input Pins of the First-Stage
Current Sense Amplifier (CSL,
CSH)
The Current Sense Amplifier senses the boost inductor
current for line current-waveform shaping and
detecting the drain voltage valley.
The sense amplifier is arranged as a differential
amplifier featuring unity gain and an output voltage
offset of 1.25V, as seen in Figure 4-3. The offset allows
a negative boost inductor sense voltage to be
processed as a positive voltage. Note that positive
boost inductor current produces negative sense
voltage at the current sense resistor RLBS.
The resistance of each gain setting resistor RCSA is
nominally 10 kΩ. Two of the gain setting resistors are
provided internally to the HV9805, and two are
provided externally. Complete the differential amplifier
setup by adding two RCSA resistors of 10 kΩ and of 1%
tolerance, as indicated in Figure 4-3.
To improve drain voltage valley detection, a second set
of resistors RVAL and a capacitor CVAL can be added to
the amplifier setup, as shown in the Typical Application
Circuit and Block Diagram. Detection signal amplitude
can be adjusted freely by the CVAL and RVAL selection,
with larger values generating a larger detection signal
from the drain voltage swing. Starting values of 100Ω
and 10pF for RVAL and CVAL are suggested. Provide
detection resistors in both legs of the sense amplifier to
keep the amplifier setup balanced.
The combination of resistors RVAL and RCSA at the
CSH pin can be replaced by a single resistor, RCSH.
Refer to the Typical Application Circuit and to the Block
Diagram for more details.
3.3 Input Pin of the Headroom Voltage
Sense Amplifier (HVS)
Connect the HVS pin to the drain of the constant
current regulator FET with a resistive divider.
The addition of a Zener diode at the HVS pin is required
to protect the HVS pin from an overvoltage condition at
shutdown of the LED driver. Overvoltage at the HVS pin
can occur as the bus capacitor remains charged for a
significant time after shutdown. The headroom voltage
rises significantly as the forward voltage drop across
the LED load drops towards zero. Consequently, the
voltage at the HVS pin rises as well, and may take the
voltage at the HVS pin above its absolute maximum
rating without an external Zener diode in place.
2015 Microchip Technology Inc.
DS20005374A-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HV9805.PDF ] | |
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